Process for producing low viscosity isocyanate trimers

Details Process for producing low viscosity isocyanate trimers Process for producing low viscosity isocyanate trimers

1991-09-30

1994-03-29

Kight, III, John

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Treating polymer containing material or treating a solid...

528497, 528502, 560352, C08F 600, C08F 610

Patent

active

052984311

ABSTRACT:
This invention relates to a multi-step process for isolating a cyclotrimerized isocyanate from mixture containing said cyclotrimerized isocyanate plus an isocyanate oligomer which comprises the steps of: (a) contacting said mixture with a liquid solvent to provide a solvent-containing mixture, (b) extracting said solvent-containing mixture by liquid-liquid extraction to cause said solvent-containing mixture to elute into an extractate and a residue, wherein said extractate is a cyclotrimerized isocyanate that is essentially oligomer-free and is further characterized by having reduced viscosity relative to said solvent-containing mixture, and (c) separating uncyclotrimerized monomer from said extractate to provide a reduced viscosity trimer product that is essentially free of monomer. Also disclosed is the reduced-viscosity product produced by this process.

REFERENCES:
patent: 4220728 (1980-09-01), Kresta et al.
patent: 4265798 (1981-05-01), Mishra
patent: 4324879 (1982-04-01), Bock et al.
patent: 4412073 (1983-10-01), Robin
patent: 4876380 (1989-10-01), Chen et al.
patent: 4963675 (1990-10-01), Robin et al.

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